Improved piston packing



naar can.

' `i RLI 15.,

Jeannineuns, orV sAXroNyPnNNsYLVANIA.

L l' Letters Patent N0.`1`04,459, dated Juncv2l, 1870.

. y `nvnnvrm PIsToN BACKING.

v.lflie Schedulerefetred to in these Letters Patent and making-part of the same.

packing for steam-cylinderpistons which shall be simi ple'and durable, and readily adjustable to the walls o f g the cylinder; andv i It consists in the construction and arrangemeet of certain parts in combination with the 'packing-ring, `yhereinafter'more fully described. i i i "1 i The accompanyingtdrawing-representsapiston'provided with packing according to my invention. j v Similar letters of reference indicate corresponding l yparts.` i y i 1 f A represents the cylinder. Y

. B the packing-rings, in two. or more. parts, as seen` in the drawing. i l O is the cone, circular in `fornnliaving upon its rim, y D, three, more or less, loose triangular-shaped blocks, marked E, the sides of `which are inclined planes, against `the, ends of which the packing springs bear. 'l F represents the packing springs, of irregular form. The sides next the packing-ring are arcs of'circles, `but of greater radius than the rings, `so thatbetween i 1` `its endsand center there is a spacewhieh does not ,f lbear upon a ring. n

The ends ofthev spring form obtuse angles with the sides, as seen, and bear upon the sidesofvthe triangn lar blocks E, as represented. V G is the tightening bolt, connected with the ends oi v'the two'upper springs with the tightening nuts H H thereon, bearing against the ends I I of the springs. The effect of tighteningV up the springs is to bow or force out against the ring the central portion of the spring, which portion will recoil as the packing Wears and thereby keep the ring tightly` packed againstthc cylinder. V

The blocks E, it will be observed, are arranged so as to operate more directly on the'lower portion of the piston,\vl1ich arrangement is, of conrse,'designcd to apply to a piston moving horizontally, but which arrangement would not be adhered'to in packing a piston moving vertically. l

The blocks E are movable on-the rim D of the core,

so that they readily adj ust themselves according to the force and tension ofthe separate springs. g Having thus described my invention,

i I claim as newand desire to secure by Letters Patent- `1. In combination with the packing-springF, the l core O, with the rim D,.and the block4 E, working thereon, arranged substantially as and for the purposes described.

2. vThe springs F, in combination with the block'E, rim D, and bolt G, arranged andI operating substantially as andfor the purposes described. i

y JOHN HUGHES. Witnesses J AMES MCMURTRIE, DANIEL J. GILCHRIST; 

